In Japan, there is no concept of “Fair Use”, it’s why they don’t have a modding scene and why Japanese devs actively fight against people trying to mod their games. Nintendo uses DMCA on things that are clearly fair use (Parodies like SML, Nintendo themed mods on Garry’s Mod), and people cave solely because they can’t afford to go to court.

It’s also literally a criminal offense to modify Pokemon data because tournaments in that scene are taken that seriously.